The Stora Enso building, she said, was chosen "because it is a symbol of power and it is in a central, almost monumental place".

It was due to be screened - "only once", AFP notes - on Wednesday at 2000 local time (1800 GMT).

Yes, there is a chance that you might miss a very important point [if you nip away to use the toilet] but if you gotta go, you gotta goRasmus Nielsen , Superflex

Past works by Superflex, as the Danish art group call themselves, include a cockroach-level tour of London's Science Museum and a campaign to paste red posters around Copenhagen reading (in English) "Foreigners please don't leave us alone with the Danes".

The group also created an installation in Heerhugowaard, the Netherlands, called Power Toilets - a copy of lavatories used by members of the UN Security Council at UN headquarters in New York.

Asked by the BBC News website if anybody watching the 10-day film in Helsinki could safely nip away to use the toilet without missing a key moment in the film, Superflex's Rasmus Nielsen replied:

"Yes, there is a chance that you might miss a very important point but if you gotta go, you gotta go."